Pneumatic tire



Patented Sept. 27, 1927.

some I. Purina, or Burr-3L0, saw 103:.

minimum Tran.

Application filed October 2, 1828. Serial No. 886,104..

This invention relates to im rovements in pneumatic tires and is a ramication of the broad invention disclosed in my co-pending application562,235, filed May 6, 1922.

6 In the prior filed application, I disclosed a tangent laid carcass ofnormal oblate cross-sectional contour having associated therewithuacontinuous resilient web of rubber functioning to normally maintain thetire in oblate contour and resiliently resisting its distension fromsuch contour, this construction permitting the obtaining of a number ofvery meritorious and novel results 111 addition to the maintenance of aflat contact therein under load.

In the instant application I have provided an inner tube with which isformed or associated a similar resilient rib for functioning in the samemanner in combination with an enclosing tire casing;

I have disclosed several embodimentsof my invention in the accompanyingdrawing, in which 7 Figure 1 is a transverse section through a casintour in which is located an inner tube embodying the instant invention.

Fig. 2 is a similar transverse cross-section through a tire of normallysubstantially circular cross-section as constructed in present daypractice.

In the embodiment disclosed in Fig. 1, 10 indicates a rim flanged forthe combination of the tire casing 11,.which is of normally oblatecross-sectional: contour, as disclosed in my co-opending application562,235, with the exception of the resilientv rib shown therein. 12indicates an inner tube havin the side walls 12 adually increasing in tickness and merging with a resilient rubber rib 12, preferably locatedintermediate the sides at the outer portion of the tube. As shown in thedrawings, this tube is shown in its normal uninflated or slightlyinflated con tour.

When the tire is inflated to the desired pressure, as, for example onehundred pounds, the casing 11 and tube 12 will be extended at the outerportion .to arcua'te contour, which distention will beiresisted by therib 12 which is thereby placed under tension. This tension serves toartially neutralize the air pressure within t e tube so far as actionunder load is concerned so that of normal oblate cross-sectional con-'when a relatively light load is carried upon casing is depressed towardits uninflated contour at which the maximum load contact is had.Depression of the casing below its normal contour, as when striking arock, obstacle or the like will likewise be resisted by the rib 12 whichis again put under tension and coacts in such resistancewith the airpressure to resist such depression.

In Fig. 2, I have illustrated a present day casing 15 of substantiallcircular crosssectional contour, which 0 viously will not be susceptibleof appreciable distention under inflation as circular contour is thatwhich a tire will naturally assume according to the laws of physics. Inthe casing 15, I show a tube '16 of part circular contour having theflattened upper portion 16, the side-walls 16 being gradually thickenedto merge into the lar e resilient rubber rib 16 located beneath theflattened portion 16. As the tube is inflated to fill the interior ofthe casing 15, rib 16 is put under tension, as described in connectionwith-the showing in Fig. 1, and the function will be substantiallysimilar in that the circular casing will be permitted to approximate anoblate contour under load until the balance results between theresistance of the air ressure, tension of the rib 16, and the loa uponthe casin so that a flat tread contact under load may eobtained with asubstantially circular casing with the required inflation, thuspermitting results similar in proportion at least to those obtained bythe more desirable normally oblate contour casing described above.

I do not wish to be restricted to the form of my invention as shown inthe accompanying drawings and described in the specification, except asdefined in the appended claims What I claim is:

1. The combination witha casing of normally oblate cross-sectionalcontour, an influtabie' inner tube of homologous contour; flatable innertube of analogous contour, said tube bein provided Witha resilientrubsaid tube being rovided with means to reber rib resisting distentionbeyond normal 10 siliently resist distention from normal concontourofsaid tube and easing. 5 tour of said casing and tube. In testimonywhereof, I have subscribed 3. In combination with a casing of normyname. I molly oblate cross-sectional contour, on in- JUHN I PALMER.

